logical operation functions in c; And, Or, Xor, Not etc..

How would I set up gateAnd(), gateOr()...etc...

I have never tried to replicate these operations with a program, and also first time using c, only have used Java previously..

I also will have to setup halfAdder, and fullAdder.

Here is the code:

Code:

---

#include "stdlib.h"
#include "assert.h"
#include "stdio.h"
#include "circuit.h"

int main(int argc, char * argv[])
{               
        struct gate * g = gateInput("Type an Integer");
        gatePrint(g);               
        return 0;
}

        struct gate * gateInput(char * prompt)
        {               
                int i;
                printf(prompt);
                scanf("%d", &i);
                return gateConstant(i);
        }

        struct gate * gateConstant (int value)
        {
                struct gate * r = (struct gate *) malloc(sizeof(struct gate));
                assert(r != 0);

                if (value == 0)
                return gateZero();

                if (value == 1)
                return gateOne();
        }

        struct gate * gateZero()
        {
                struct gate * r = (struct gate *) malloc(sizeof(struct gate));
                assert(r != 0);
                r -> gateType = ConstantZeroGate;
                return r;
        }

        struct gate * gateOne()
        {
                struct gate * r = (struct gate *) malloc(sizeof(struct gate));
                assert(r != 0);
                r -> gateType = ConstantOneGate;
                return r;
        }

        void gatePrint (struct gate * e)
        {
                printf("The entered Value: %d \n",*e);
        }

        int gateEval (struct gate * e)
        {
               
        }

        void intToBit (int value, int * eights, int * fours, int * twos, int * ones)
        {
                assert ((value >= 0) && (value < 16));
                *ones = value % 2;               
        }

        struct gate * gateNot(struct gate * arg)
        {
       

        }
       
        struct gate * gateAnd(struct gate * left, struct gate * right)
        {

        }

        struct gate * gateOr(struct gate * left, struct gate * right)
        {

        }

        struct gate * gateXor(struct gate * left, struct gate right)
        {

        }

        void halfAdder(struct gate * left, struct gate * right, struct * carryin, struct gate **sum)
        {

        }

---

FAQ > Explanations of... > Bit shifting and bitwise operations
FAQ > Prelude's Corner > Bit manipulation
Of use?

Logical operators &&, ||, ! are similar (but different).

Hi,
In C u can achive this by using '&&' for AND, '||' for OR, '!' for NOT, '^' for XOR, '&' bitwise AND,'|' Bitwise OR . Better refer to some "using Logical operators and bitwise operators in C". Through manipulating them you can setup Half adder and Full adder.

Thank you for the link, it's a good reference

Thank you "maven" for the info, I was using bitwise for OR , AND and need them for integers..

what do you think about the intToBit function?

What do you think about this code? will these functions operate properly?

Code:

---

void intToBit (int value, int * eights, int * fours, int * twos, int * ones)
        {
                assert ((value >= 0) && (value < 16));
                *ones = value % 2;
                *twos = (int)(value/2) % 2;
                *fours = (int)((value/2)/2) %2       
                *eights = (int)(((value/2)/2)/2) %2       
        }

        struct gate * gateNot(struct gate * arg)
        {
                struct gate * r = !arg;
                return r;
        }
       
        struct gate * gateAnd(struct gate * left, struct gate * right)
        {
                struct gate * r = left && right;
                return r;
        }

        struct gate * gateOr(struct gate * left, struct gate * right)
        {
                struct gate * r = left || right;
                return r;
        }

        struct gate * gateXor(struct gate * left, struct gate right)
        {
                struct gate * r = left ^ right;
                return r;
        }

---

Read the difference between in " Logical AND '&&', Logical OR '||' " and "Bitwise AND '&', Bitwise OR '|' " respectively. Then Use them according to your need.

Anyone with a solution?

Here is my Errors:

Code:

---

assignment1.c: In function `gateNot':
assignment1.c:74: warning: initialization makes pointer from integer without a cast
assignment1.c: In function `gateAnd':
assignment1.c:80: warning: initialization makes pointer from integer without a cast
assignment1.c: In function `gateOr':
assignment1.c:86: warning: initialization makes pointer from integer without a cast
assignment1.c: In function `gateXor':
assignment1.c:92: error: invalid operands to binary ^
assignment1.c: At top level:
assignment1.c:96: error: syntax error before '*' token

---

And here is the code

Code:

---

struct gate * gateNot(struct gate * arg)
        {
                struct gate * r = !arg;
                return r;
        }
       
        struct gate * gateAnd(struct gate * left, struct gate * right)
        {
                struct gate * r = (left && right);
                return r;
        }

        struct gate * gateOr(struct gate * left, struct gate * right)
        {
                struct gate * r = (left || right);
                return r;
        }

        struct gate * gateXor(struct gate * left, struct gate * right)
        {
                struct gate * r = (left ^ right);
                return r;
        }

---

Hi,

Here Its a limitation of C, that you can not make basic operations through predefined operators on User defined variables. As structure leads to a userdefined variable. extract out predefined datatypes from structure and then apply these basic operations on them.